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<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=511084
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  <meta charset="utf-8">
  <title>Test for Bug 511084</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=511084">Mozilla Bug 511084</a>
<p id="display"><iframe></iframe></p>
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<pre id="test">
  <script type="application/javascript">
  /** Test for Bug 511084 **/
  var doc = frames[0].document;
  doc.replaceChild(doc.createElement("iframe"), doc.documentElement);
  ok(frames[0][0] instanceof Window,
     "Should have a subframe window for a root iframe");
  </script>
</pre>
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